I’m Sarah. I’m a Brit who fled to Portugal on account of Brexit, increasing intolerance and the British weather. I like climbing (although I can’t do much any more for health reasons) and sailing. This is a Friendica account. Friendica is kinda like Facebook as Mastodon is kinda like Twitter, except they can talk to each other.
@yogthos I did.
Scramjets are fundamentally fighting Newton’s 3rd law. Slow air down by Mach 5 only to speed if back up to Mach 5 again. You’re burning tonnes of fuel to accomplish almost nothing.
If they have a practical scramjet vehicle (they don’t), then they should feel free to show the world, rather than posting vacuous bullshit on the Internet.
@yogthos the tl;dr is that you basically have super high energy air coming in at Mach 5. You then have to take all that energy away to get your fuel to burn in it, which barely gets you past break even. They create massive amounts of drag too and in order to function need to stay in the part of the atmosphere that’s thick enough to breathe, thus prolonging the drag and problematic heat generation.
Given the point of a scramjet is to get you into a suborbital trajectory for a rapid glide to your destination, the fact that they have inherently terrible thrust performance and only work when you’re in the bit of the atmosphere you desperately don’t want to be in, they’re uniquely terrible at it.
Turborockets solve these problems. Get up to Mach 5 on air, close the intakes, run on liquid oxygen, and CLIMB.
They’re lighter, more efficient, and faster than hypersonic air breathers. You wanna go that fast, use a rocket, and get away from the nasty draggy burny stuff. As enticing as the idea of “free oxidiser” is, it’s a sucker bet.
@yogthos plenty of published stuff on why scramjets aren’t practical and air breathing hypersonic transport is basically a white elephant even if you’re able to do it.
I’m not your butler
@yogthos Oh, their rail network is impressive and I wish it was being copied elsewhere.
But this … is not credible.
@yogthos No, just someone who can smell obvious bullshit. SCRAMjets basically don’t work for any real world application, and can’t. They inherently have utterly useless power to weight performance.
None of this shit works on anything that’s not a scale model.
@yogthos And I’m the queen of England.
@yogthos Did it though?
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@yogthos “The paper”.
This isn’t a paper. It’s a blog post.
It’s no more a “paper” that is subject to any kind of scientific debate than some rando who said they made cold fusion in their microwave.
“Jumbo jet prototype”. Bless.